Notice how the options are laid out horizontally with the labels to the right,
and that the second option is pre-selected:

Train

Plane

Automobile

Riverboat

Submarine

[0] :ClassRadioButtonGroupAdvanced : MiPageSample[1] ⍝ Control:: _DC.RadioButtonGroup [2] ⍝ Description:: Special options for RadioButtonGroup [3] [4] ∇ Compose;button;frm[5] :Access public
[6] [7] frm←Add_.Form[8] frm.Add_.pScriptFollows[9] ⍝ Notice how the options are laid out horizontally with the labels to the right, [10] ⍝ and that the second option is pre-selected: [11]button←'Transport'frm.Add_.RadioButtonGroup('Train''Plane''Automobile''Riverboat''Submarine')[12]button.SelectedIndex←2[13]button.LabelPos←'right'[14]button.Horizontal←1[15][16]∇[17][18][19]:EndClass